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/*
* $Id$
*/
#include <pthread.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/score/chain.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/wkspace.h>
#include <rtems/posix/cancel.h>
#include <rtems/posix/pthread.h>
#include <rtems/posix/threadsup.h>
/*PAGE
*
* POSIX_Thread_cancel_run
*
*/
void POSIX_Thread_cancel_run(
Thread_Control *the_thread
)
{
int old_cancel_state;
POSIX_Cancel_Handler_control *handler;
Chain_Control *handler_stack;
POSIX_API_Thread_Support_Control *thread_support;
ISR_Level level;
thread_support = the_thread->API_Extensions[ THREAD_API_POSIX ];
handler_stack = &thread_support->Cancellation_Handlers;
old_cancel_state = thread_support->cancelability_state;
thread_support->cancelability_state = PTHREAD_CANCEL_DISABLE;
while ( !_Chain_Is_empty( handler_stack ) ) {
_ISR_Disable( level );
handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack );
_Chain_Extract_unprotected( &handler->Node );
_ISR_Enable( level );
(*handler->routine)( handler->arg );
_Workspace_Free( handler );
}
thread_support->cancelation_requested = 0;
thread_support->cancelability_state = old_cancel_state;
}
/*PAGE
*
* 18.2.1 Canceling Execution of a Thread, P1003.1c/Draft 10, p. 181
*/
int pthread_cancel(
pthread_t thread
)
{
Thread_Control *the_thread;
POSIX_API_Thread_Support_Control *thread_support;
Objects_Locations location;
the_thread = _POSIX_Threads_Get( &thread, &location );
switch ( location ) {
case OBJECTS_ERROR:
return EINVAL;
case OBJECTS_REMOTE:
return POSIX_MP_NOT_IMPLEMENTED();
case OBJECTS_LOCAL:
thread_support = the_thread->API_Extensions[ THREAD_API_POSIX ];
thread_support->cancelation_requested = 1;
_Thread_Enable_dispatch();
return 0;
}
return POSIX_BOTTOM_REACHED();
}
/*PAGE
*
* 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183
*/
int pthread_setcancelstate(
int state,
int *oldstate
)
{
POSIX_API_Thread_Support_Control *thread_support;
if ( !oldstate )
return EINVAL;
if ( state != PTHREAD_CANCEL_ENABLE && state != PTHREAD_CANCEL_DISABLE )
return EINVAL;
thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
*oldstate = thread_support->cancelability_state;
thread_support->cancelability_state = state;
if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE &&
thread_support->cancelability_type == PTHREAD_CANCEL_ASYNCHRONOUS &&
thread_support->cancelation_requested )
POSIX_Thread_cancel_run( _Thread_Executing );
return 0;
}
/*PAGE
*
* 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183
*/
int pthread_setcanceltype(
int type,
int *oldtype
)
{
POSIX_API_Thread_Support_Control *thread_support;
if ( !oldtype )
return EINVAL;
if ( type != PTHREAD_CANCEL_DEFERRED && type != PTHREAD_CANCEL_ASYNCHRONOUS )
return EINVAL;
thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
*oldtype = thread_support->cancelability_type;
thread_support->cancelability_type = type;
if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE &&
thread_support->cancelability_type == PTHREAD_CANCEL_ASYNCHRONOUS &&
thread_support->cancelation_requested )
POSIX_Thread_cancel_run( _Thread_Executing );
return 0;
}
/*PAGE
*
* 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183
*/
void pthread_testcancel( void )
{
POSIX_API_Thread_Support_Control *thread_support;
thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE &&
thread_support->cancelation_requested )
POSIX_Thread_cancel_run( _Thread_Executing );
}
/*PAGE
*
* 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184
*/
void pthread_cleanup_push(
void (*routine)( void * ),
void *arg
)
{
POSIX_Cancel_Handler_control *handler;
Chain_Control *handler_stack;
POSIX_API_Thread_Support_Control *thread_support;
if ( !routine )
return; /* XXX what to do really? */
handler = _Workspace_Allocate( sizeof( POSIX_Cancel_Handler_control ) );
if ( !handler )
return; /* XXX what to do really? */
thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
handler_stack = &thread_support->Cancellation_Handlers;
handler->routine = routine;
handler->arg = arg;
_Chain_Append( handler_stack, &handler->Node );
}
/*PAGE
*
* 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184
*/
void pthread_cleanup_pop(
int execute
)
{
POSIX_Cancel_Handler_control *handler;
Chain_Control *handler_stack;
POSIX_API_Thread_Support_Control *thread_support;
ISR_Level level;
thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
handler_stack = &thread_support->Cancellation_Handlers;
if ( _Chain_Is_empty( handler_stack ) )
return;
_ISR_Disable( level );
handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack );
_Chain_Extract_unprotected( &handler->Node );
_ISR_Enable( level );
if ( execute )
(*handler->routine)( handler->arg );
_Workspace_Free( handler );
}
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